There were variations in the torque at the time of tightening, and there were several pretty hard ones. However, it was not possible to use it. Because it is a part that requires the number, I want a 50/100 pack.

The virtually nut loosened at the place where it was vibrating, and there was an indication from the customer. I tried to study the use of loosening-prevention nuts for testing, but saw many kinds, but because this product is used in large quantity, this product is inexpensive and very much appreciated.

I bought M3, 4, 5, but M3 has many losers, it is excessively biting into the male screw and requires extraordinary force to tighten. Screw thread is scraped, not only nut but also male screw can not be reused.